#include <time.h>
#include "syscall.h"
#include "atomic.h"

static int syscall_clock_gettime(clockid_t clk, struct timespec *ts)
{
	return __syscall(SYS_clock_gettime, clk, ts);
}

void *__vdsosym(const char *, const char *);

/* There is no other implemented value than TIME_UTC, all other values
   are considered erroneous. */
int timespec_get(struct timespec * ts, int base)
{
	if (base != TIME_UTC) return 0;
	int ret;
#ifdef VDSO_CGT_SYM
	static int (*cgt)(clockid_t, struct timespec *);
	if (!cgt) {
		void *f = __vdsosym(VDSO_CGT_VER, VDSO_CGT_SYM);
		if (!f) f = (void *)syscall_clock_gettime;
		a_cas_p(&cgt, 0, f);
	}
	/* The vdso variants never fail, and thus never set errno. */
	ret = cgt(CLOCK_REALTIME, ts);
#else
	ret = syscall_clock_gettime(CLOCK_REALTIME, ts);
#endif
	return ret < 0 ? 0 : base;
}